I thank you for your enquiry and your patience.
I understand that this may be very frustrating for you, particularly since the tenant keeps changing the date for leaving.
Unfortunately, you would not be able to simply change the locks on the door and remove their things. If they do not leave on the date the notice states you would have to commence proceedings in the court to get an order for recovery of possession. This will allow you to be able to take control of the property.
Practically though, I recommend speaking to the tenant and advising them that if they do not leave on the date stipulated you would commence proceedings. You should also let them know that you will ask the court to have them pay any costs incurred by you in commencing court proceedings.
The threat of court proceedings usually receives a positive response.
Can I clarify anything for you?
Hopefully, I have answered your query in a way that is simple and easy to understand. If anything remains unclear, I will be more than happy to clarify it for you. In the meantime, thank you once again for using our services.